Jump to content
  • Member Statistics

    17,607
    Total Members
    7,904
    Most Online
    NH8550
    Newest Member
    NH8550
    Joined

January 20-21 2012 Snowstorm OBS & Disco


earthlight

Recommended Posts

Isn't there a Phily forum. :P

More significant snowfalls usually have the 850mb 0 degree line very close by. Heavy snow is SNJ is not climatologically good for NYC north.

Even though we are located within the Mt. Holly zone, most of us are technically closer to NYC, hence why we usually post in both Philly and NYC. Let's hope we can all get in on the fun tonight and tomorrow!! :sled:

Link to comment
Share on other sites

  • Replies 1.3k
  • Created
  • Last Reply

Because we are less than 10 hours away from seeing snow, I don't see the sense of using the global models anymore, maybe the immediate short range models.

All models have the best verification scores from hour 0-6. Euro is #1 in the hour 0-12 range. Better then any hi-res model.

Nowcasting is ancient. As Trials said, the 6zs runs will pinpoint precip amounts and warming best.

Link to comment
Share on other sites

All models have the best verification scores from hour 0-6. Euro is #1 in the hour 0-12 range. Better then any hi-res model.

Nowcasting is ancient. As Trials said, the 6zs runs will pinpoint precip amounts and warming best.

How do the Europeans do it...

Link to comment
Share on other sites

If anything watch this link, you can see the warm punch already approaching SW PA well out ahead of the main QPF shield

http://www.spc.noaa.gov/exper/mesoanalysis/new/archiveviewer.php?sector=19&parm=thck

Nice loop. This was very well forecast by all of the models over the past two days. We have to watch how far north the surface low gets in the Ohio Valley.

Link to comment
Share on other sites

The Euro is a higher resolution than the GFS, that and Congress keeps cutting funding

NOAA has an over $5,000,000,000 budget. You would think they could create a good forecast model. Anyway, temps will slowly decline in New York from the lower 30's where they are now to the mid-upper 20's when the snow starts.

Link to comment
Share on other sites

Well, were aren't getting precip without WAA, so it has to be there to some extent.

That loop does show how the precip is now breaking out in Ohio along the leading edge of the WAA. The concern at the moment is that the freezing line at all levels is steadily moving north, not just at the mid-levels. I'm not worried about it as all of the models seem to be pretty locked in, just saying that don't be suprised if precip arrives a tad earlier than progged.

Link to comment
Share on other sites

Anyway, back to the situation at hand. Tidbit from upton

LOW PRESSURE APPROACHES FROM TENNESSEE VALLEY AND MOVES OFF

DELMARVA COAST. NOT MUCH DEEPENING WITH THE LOW AS UPPER LEVEL

FLOW IS QUASI ZONAL WITHOUT MUCH MERIODIONAL COMPONENT TO FLOW AS

WELL AS A LACK OF PHASING BETWEEN UPPER AND LOWER LEVELS. NE FLOW

SHOULD RESULT IN SOME ENHANCEMENT ACROSS HIGHER ELEVATIONS BUT NOT

CONFIDENT AS TO WHERE THIS ENHANCEMENT WILL TAKE PLACE. THE 0.3 TO

0.5 INCH LIQUID EQUIVALENT HAS SPATIAL VARIANCE WITHIN THE MODELS

AND ACCOUNTS FOR THIS EXTRA UNCERTAINTY. THEREFORE HAVE WINTER

WEATHER ADVISORY FOR TIME BEING. IF WAA ONSET OF SNOW RESULTS IN

QUICK ACCUMULATION OF SEVERAL INCHES ACROSS INTERIOR...SHORT FUSED

WINTER STORM WARNING MAY NEED TO BE REASSESSED. BEST SNOWFALL

WOULD BE STARTING EARLY SAT MORNING AND CONTINUING REST OF MORNING

AS WELL AS INTO EARLY AFTERNOON. 12Z SHOWN BY MODELS TO BE BEST

TIME OF LOW TO MID LEVEL FORCING WITH DECENT Q VECTOR CONVERGENCE

FROM 850 TO 500 MB.

Link to comment
Share on other sites

should be nice ratios for us N and W of the city.....

If the entire column had remained nice and cold then yes, but depending on how far north that mid-level warm layer gets it will have an affect on ratios. Of course, as Trials said, we need the WAA to enhance QPF, we just don't want too much of it.

Link to comment
Share on other sites

esp because my whole winter weenie life im used to nailbiting these events....and now its great to be on the northern fridge but with high ratios, without having to sweat it out.

You benefit in the fact that subsidence should be minimal. It's not like a coastal where banding becomes the main focus and everyone else gets screwed.

Link to comment
Share on other sites

Archived

This topic is now archived and is closed to further replies.

  • Recently Browsing   0 members

    • No registered users viewing this page.

×
×
  • Create New...